Abstract
The polysaccharide isolated from Acacia macracantha gum, a Venezuelan Gummiferae spp., contains galactose, arabinose, rhamnose, glucuronic acid and its 4- O-methyl analogue. 13C-NMR spectroscopy, in combination with chemical methods, was applied in this study. A complex fragment, constituted of galactose, arabinose and glucuronic acid (3:2:1), was obtained from the original polysaccharide and its degradation products. This fragment appears to be an important structural feature of the gum. The backbone of the structure (degraded gum B) is a β-(1→3) galactan, although glucuronic acid and arabinose residues are still present in the core of the structure. Stereochemistry of the molecule may work against periodate oxidation of these sugar residues. Arabinose may be present as internal residues and as short side-chains while glucuronic acid exists mainly as a terminal residue.
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